These industries in many cases are truly the only jobs offered to ladies during colonization because they don’t need much language abilities or more education.
Consider it: Colonization brings an upheaval for the status quo. An alien language is introduced, the market is in flux, and (with militarization) international guys are brought in.
Now the terms for survival are very different. With additional soldiers, there was a need for pubs, strip clubs, and cash for intercourse. The line between solution and intercourse is blurred free mail order brides.
More to the point, as soon as the colonizer plus the look that is colonized, it leads to Orientalism.